.instagram:hover
  background:radial-gradient(circle farthest-corner at 35% 100%,#fec564,transparent 50%),
             radial-gradient(circle farthest-corner at 10% 140%,#feda7e,transparent 50%),
             radial-gradient(ellipse farthest-corner at 0 -25%,#5258cf,transparent 50%),
             radial-gradient(ellipse farthest-corner at 20% -50%,#5258cf,transparent 50%),
             radial-gradient(ellipse farthest-corner at 100% 0,#893dc2,transparent 50%),
             radial-gradient(ellipse farthest-corner at 60% -20%,#893dc2,transparent 50%),
             radial-gradient(ellipse farthest-corner at 100% 100%,#d9317a,transparent),
             linear-gradient(#6559ca,#bc318f 30%,#e42e66 50%,#fa5332 70%,#ffdc80 100%)

.github:hover
    background: #444

.weibo:hover
    background: #ff3f34
